The bug is there, but there is a workaround: add the boot option 'nopersistent'. This means that with 'nopersistent' and 'toram' all partitions on the boot drive can be unmounted and the drive can be unplugged or the casper-rw partition can be repaired or backed up without problems.
Exploring the boot option 'nopersistent':
The bug is there, but there is a workaround: add the boot option 'nopersistent'. This means that with 'nopersistent' and 'toram' all partitions on the boot drive can be unmounted and the drive can be unplugged or the casper-rw partition can be repaired or backed up without problems.